Pinpoint Test D: The Courtesy Lamps Do Not Turn On With One Door Open

Interior Lighting

Pinpoint Tests

Pinpoint Test D: The Courtesy Lamps Do Not Turn On With One Door Open

Refer to Wiring Diagram Set 57, Driver Door Module for schematic and connector information. Diagrams By Number

Normal Operation

The Driver Door Module (DDM) monitors the door ajar switches. The door ajar switches provide ground, indicating an open door. The DDM then signals the Lighting Control Module (LCM) to supply power to the courtesy lamps.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Door ajar switch
- DDM



PINPOINT TEST D: THE COURTESY LAMPS DO NOT TURN ON WITH ONE DOOR OPEN

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

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D1 CHECK FOR VOLTAGE FROM THE DDM


- Ignition OFF.
- Measure the voltage between the suspect door ajar switch connector, harness side and ground as follows:









- Is the voltage greater than 10 volts at the suspect door ajar switch?

Yes
GO to D2.

No
GO to D3.

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D2 CHECK FOR VOLTAGE TO THE DOOR AJAR SWITCH USING THE CONNECTOR GROUND


- Disconnect: Suspect Door Ajar Switch.
- Measure the voltage between the suspect door ajar switch connector, harness side as follows:









- Is the voltage greater than 10 volts at the suspect door ajar switch?

Yes
INSTALL a new door ajar switch in question. REFER to Doors, Hood and Trunk &/or Locks. TEST the system for normal operation.

No
REPAIR circuit 57 (BK) for an open. TEST the system for normal operation.

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D3 CHECK THE DOOR AJAR REFERENCE CIRCUIT FOR AN OPEN


- Disconnect: DDM C501a and C501b.
- Measure the resistance between the suspect door ajar switch, harness side and the DDM, harness side as follows:









- Is the resistance less than 5 ohms?

Yes
GO to D4.

No
REPAIR the circuit in question for an open. TEST the system for normal operation.

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D4 CHECK FOR CORRECT DDM OPERATION


- Disconnect all the DDM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the DDM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new DDM. REFER to Body Control Systems. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

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